Ivie IE-45 STI-PA - Speech Intelligibility Analysis User Manual
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--STI-PA Test Signal--
The user needs to provide a playback device for the Ivie STI-PA test signal. The Ivie STI-PA
test signal is on the CD supplied with each Ivie STI-PA software package. The source signals
may also be downloaded as .wav files from the web site: www.ivie-europe.com/stipa
Only the Ivie STI-PA source should be used with the Ivie STI-PA instrument.
There are two different STI-PA test signals on the CD; one for Male voice testing and another
for Female voice testing. The IE-35 needs to be set to work with the Male or Female test signal.
The IE-35 Male/Female voice option is set in the "Options", "Preferences" menu.
These two STI-PA test signals (Male/Female) are stored on the CD in two different formats,
WAV and a CD digital audio file.
The WAV file can be played directly from a computer, PDA or a MP3 player that plays WAV
files. The CD digital audio file can be played on most standard CD audio players.
--Certification of Playback Device--
Whichever playback device is chosen, it must be certified. This is easily accomplished by
electrically connecting the output of the playback device directly to the IE-35 and running a few
STI-PA tests. This is also an excellent way to become familiar with the STI-PA program.
Step 1 - Use a standard audio cable to connect the output of the playback device to the Channel
#1 (white) RCA connector on the IE-35.
STEP 2 - Open the Ivie STI-PA program and select the "Options" menu and select "Preferences".
Step 3 - Press the "More" menu item in the lower left-hand corner of the screen and select
"Select Input/Calibrate..."
Step 4 - Now select "RCA (Channel #1) as the input and then press the "OK" button on the Input
screen and then the "OK" button on the Preferences screen to return to the main screen.
Step 5 - Now start the playback source and while watching the SPL meter, adjust the output level
of the player so the SPL meter reads about 80 dB.
Step 6 - Press the "Start" button to make the first test. The test will run for about 15 seconds and
display the STI-PA number. It should be 0.96 to 1.0. Press the "Avg" button to start an average.
Step 7 - Repeat Step number 6 five more times, pressing "Avg" at the end of each test.
Step 8 - Review the results. Look at the line that says "6 test avg-0.XX/Last test-0.YY" The
value of XX should be .97 or greater in order to certify the player.